UI Sprites, Buttons, Canvases, Prefabs and a new Font Added

Assets/Scripts/UI/ButtonBehaviour.cs

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+using UnityEngine;
+using UnityEngine.EventSystems;
+using TMPro;
+
+namespace UI
+{
+    public class ButtonBehaviour : MonoBehaviour, IPointerDownHandler, IPointerUpHandler
+    {
+        [SerializeField] private Vector2 offset = new Vector2(8, -8);
+        private TMP_Text text = null;
+        private Vector3 initialTextPosition = Vector3.zero;
+
+        public void OnPointerDown(PointerEventData eventData)
+        {
+            text.transform.localPosition = initialTextPosition + (Vector3)offset;
+        }
+
+        public void OnPointerUp(PointerEventData eventData)
+        {
+            text.transform.localPosition = initialTextPosition;
+        }
+
+        private void Start()
+        {
+            text = GetComponentInChildren<TMP_Text>();
+            initialTextPosition = text.transform.localPosition;
+        }
+    }
+}

Assets/Scripts/UI/ButtonBehaviour.cs.meta

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Assets/Scripts/UI/CanvasUIConnection.cs

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+using UnityEngine;
+
+namespace UI
+{
+    public class CanvasUIConnection : MonoBehaviour, IUIManager
+    {
+        public void SwitchToCanvas(string canvasName) => UIManager.Instance.SwitchToCanvas(canvasName);
+        public void CloseAllCanvases() => UIManager.Instance.CloseAllCanvases();
+        public void ExitGame() => UIManager.Instance.ExitGame();
+    }
+}

Assets/Scripts/UI/CanvasUIConnection.cs.meta

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Assets/Scripts/UI/IUIManager.cs

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+namespace UI
+{
+    public interface IUIManager
+    {
+        void ExitGame();
+        void CloseAllCanvases();
+        void SwitchToCanvas(string canvasName);
+    }
+}

Assets/Scripts/UI/IUIManager.cs.meta

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Assets/Scripts/UI/UIManager.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+namespace UI
+{
+    public class UIManager : MonoBehaviour, IUIManager
+    {
+        private static UIManager _instance = null;
+        public static UIManager Instance => _instance;
+        private Dictionary<string, Canvas> canvases = null;
+
+        private void Awake()
+        {
+            if (_instance == null)
+                _instance = this;
+
+            if (_instance != this)
+                Destroy(this);
+        }
+
+        public void SwitchToCanvas(string canvasName)
+        {
+            Initialize();
+
+            CloseAllCanvases();
+
+            canvases[canvasName].gameObject.SetActive(true);
+        }
+
+        public void CloseAllCanvases()
+        {
+            foreach (Canvas canvas in canvases.Values)
+                canvas.gameObject.SetActive(false);
+        }
+        public void ExitGame() => Application.Quit();
+
+        private void Initialize()
+        {
+            if (canvases != null)
+                return;
+
+            Transform mainCanvasTransform = transform.Find("Main Canvas");
+            canvases = new Dictionary<string, Canvas>(mainCanvasTransform.childCount);
+
+            for (int i = 0; i < mainCanvasTransform.childCount; i++)
+            {
+                Transform child = mainCanvasTransform.GetChild(i);
+                canvases.Add(child.name, child.GetComponent<Canvas>());
+            }
+        }
+    }
+}

Assets/Scripts/UI/UIManager.cs.meta

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